Apparatus for projecting lenticular film



"June 1, 1937. J. EGGERT AL 2,082,154

APPARATUS FOR PROJECTING-LENTICULAR FILM Filed June 27,. 1934 2 Sheets-Sheet 1 i i 5 l nvnfors: I Aizorneysd v June 1937- J. EGGIERTIET AL 2,1

APPARATUS FOR PROJECTING LENTICULAR FILM Filed June 27, 1934 2 Sliee'ts-Sheet 2 f I I I I l I l I I l I I I I l 1 Inventors I &

By Affbrney Patented June '1, 1937 UNITED STATES APPARATUS FOR, PROJECTING LENTICUQ LAB FILM John Eggert, Leipzig-Gohlis, and Gerd Heymer, Wolfen Kreis Bitter-feld, Germany, assignors to I. G. Farbenindustrie Aktiengesellschaft Frankfort-onrthe-Main, Germany Application June 27, 1934, Serial No. 132,703

In Germany 4 Claims.

Our present invention relates to an apparatus for the projection of lenticular film and ha s for is objects an improved apparatus of this-kind.

Reference is made to the accompanying drawings in which Fig. 1 shows diagrammatically an apparatus according to this invention,

Figs. 2 and 3, show a sectional view. through two iorms of the filter and the carbon holder,

Fig. 4 shows diagrammatically another apparatus according to this invention,

Fig. 5 shows'a front view of the arrangement shown in Fig. 4 from point F of this figure, and

Fig. 6 shows a perspective view ofan arrangement for projecting according to this invention.

Inapparatus for projecting lenticular films it is known practice to place the film with the embossed side facing the source of light and to place afilter between the source of light and the O film. Arc lamps of the known type, in which the source of light is reflected on to the picture gate by a concavemirror, involve the drawback that the shadow of the carbon'holder is thrown on the filter. Thisshadow not only causes a loss of light, but necessitates adjustment of the three primary colorswhen a lamp having a carbon holder of different thickness is to be used because the shadow always falls on the central which differs with the said thickness.

According to this invention the above drawbacks are obviated by giving the carbon holder such a shape that its projection on the filter by the arclampialls on places which are of less importance for the rendition of the colors.

According to one modification of the invention grammatically the arrangement of the lamp mirjected and arranged in the film gate U. In Fig.

2 which is a front view of Fig. 1 from the focus of the mirror S the same reference characters denote the same parts.

bon holder H is double-armed and the arms are As shown in Fig. 2 the car June 28, 1933 (C1. 88.-16 .4)

projected by the lamp on the separation zones of the filter strips r, g, b (red, green and blue) of'the v multi-color filter F.

i According to another modification the filter has a form which allows the placing of it near to the mirror. The design of the filter is such that while there is as little loss of light as possible due to masking, the carbon holder can be moved to and fro as desired. With this modificationthe filter is recessed at suitable places, so that it can be moved along the holder of the positive carbon and be placed between the carbon holder and the carbon points. The recessed portion of the filter is in part adapted to the form of the carbon holder, the latter being so'designed that it masks the filter either transversely to the direction of the filter strips, or. parallel to the filter strips in the zone of the lines of junction of two filter strips.

of the arc lamp, H the 'carbon holder and AF the filter which is recessed for the passage of the carbon holder and the negative carbon. L is' the lenticular filmto be projected and arranged in the film gate U.

Figsu4 and 5 show arrangements of the filter and the carbon holder, the form of the carbon either'on y transversely to'the direction of the filter strips (Fig. 4-) or parallel to the line of junction of two filter strips (Fig. 5). F is the filter with the filter strips blue, green, red (b, g, r) in the frame'R. H is the carbon holder. N is the positive carbon which is arranged in the direction of theoptical axis. In Fig. 4 the frame R of the filter F is shaped in such a manner that a cut out is formed at G through which-the carbon holder bearing the positive carbon N can be passed. The free space between the carbon hold-' er and the frame may be masked in any suitable manner. In Fig. 5 in the zoneof the line of junction of the color strips 1' and g, there is an arm T of the frame R which causes a masking holder being so selected that it masks the filter of the color strips corresponding with that caused by the carbon holder between the color strips 2; and 9. Two arms C and D branching off the arm T form the border of an aperture for the introductionof the carbon holder bearing the posl-. tive carbon N. The "free space between the car-. bon holder and the arms 0, D, and T may be masked by asbestos or the like. The recess provided in the filter at E for the carbon holder can likewise be masked by asbestos threads or the like, so that no light can pass.

In Fi 6 which shows a conventional view of an arrangement for printing according to the invention, S is the mirror of an arc lamp. This mirror projects an image of the are produced between the positive carbon N and the negative carbon K on the lenticular film L arranged in the picture gate U. The positive carbon N is mounted in the carbon holder H and can be adjusted with relation to the positive carbon K by means of the screw V.- The filter F is provided with a cut-out portion through, which the carbon holder H can be passed if the filter F must be arranged nearer to the mirror S than the carbon holder H. (The carbon holder H is perpendicular to the supporting block but is slightly bent in the direction of the filter.) The lower part of the separation line between the red and the blue filter strip is covered by a mas M corresponding in size with the portion of the filter cutout between the green and the red filter strip.

The invention is applicable to both mirror arc, lamps and condenser arc lamps. The apparatus is destined for use with lenticular film to be projected with the lenticular elements facing the filter.

What we claim is:

1. An illuminating device for projection of a lenticular film which comprises, in combination, an arc lamp, a lenticular film arranged with the lenticular elements facing the arc lamp, means for projecting an image of the are on said film, a multi-color filter of parallel strip form arranged between said film and said means for projecting an image of said are on said film, and a carbon holder for holding the positive carbon in the direction of the optical axis of the device, said carbon holder comprising an arm arranged in the path of the projected image to block light only from a part of a junction line between strips of said-filter and a small band perpendicular to a junction line.

2. An illuminating device for projection of a lenticular film which comprises, in combination,

' an arc lamp, a lenticular'film arranged with the lenticular elements facing the arc lamp, means for projecting an image of the are on said film, a multi-color filter of parallel strip iorm arranged between said film and said means for projecting an image of said arc on said film, and a carbon holder for holding the positive carbon in the direction of the optical axis of the device, said carbon holder comprising two arms, said arms blocking out substantially only light falling on said filter which strikes at parts of the separation lines between color strips.

3. An illuminating device for the projection of the lenticular film which comprises an arc lamp, a lenticular film arranged with the lenticular elements facing the arc lamp, a mirror for projecting an image of the are on said film, a multi-color filter arranged between said film and said mirror, said filter having a cut out extending along the separation line between two color strips and in the middle of the central color strip,- a carbon holder comprising an arm for holding the positive carbon in the direction of the optical axis and in the cut out in the middle of the central color strip, said arm extending in said cut out in the separation zone between two color strips, and means for masking the separation zones between the other color strips in the extent of said out out.

4. An illuminating device for the projection of the lenticular'film which comprises an arc lamp, a lenticular film arranged with the lenticular elements facing the arc lamp, a mirror for projecting an image of the are on said film, a multi-color filter arranged between said film and said mirror, said filter having a cut out reaching fromthe middle of one side of the filter to about the middle of the filter, a carbon holder comprising an arm for holding' the positive carbon in the direction of the optical axis and in the middle of' the central color strip, said arm extending along one side of said filter and into said out out, and means for masking the middle of the other color strips in about the extent of said out out.

JOHN EGGERT. GERD 

